JP2002253027A - Driving shaft structure of bush cutter - Google Patents
Driving shaft structure of bush cutterInfo
- Publication number
- JP2002253027A JP2002253027A JP2001052958A JP2001052958A JP2002253027A JP 2002253027 A JP2002253027 A JP 2002253027A JP 2001052958 A JP2001052958 A JP 2001052958A JP 2001052958 A JP2001052958 A JP 2001052958A JP 2002253027 A JP2002253027 A JP 2002253027A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- driving shaft
- cutting blade
- drive shaft
- operating rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/67—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator
- A01D34/68—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/835—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes
- A01D34/90—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes for carrying by the operator
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Harvester Elements (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は刈払機に関し、特に
原動機の動力を刈刃に伝える駆動軸の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush cutter, and more particularly to an improvement in a drive shaft for transmitting power of a motor to a cutting blade.
【０００２】[0002]
【従来の技術】田畑の畦等における雑草は病害虫の巣に
なりやすいことから、年に数回は刈る必要がある。この
作業は重労働であることから、様々な機械が提案され、
実用に供されている。そのような機械のうち、刈払機は
小型で取扱いが容易であることから、多く用いられてい
る。2. Description of the Related Art Weeds in field ridges and the like are apt to become nests of pests, so they need to be cut several times a year. Since this work is hard work, various machines have been proposed,
It has been put to practical use. Among such machines, brush cutters are widely used because of their small size and easy handling.
【０００３】刈払機は、パイプ状の操作杆に駆動軸を通
し、この駆動軸を、操作杆の一端に設けた原動機で回転
させることによって、操作杆の他端に設けた刈刃を回転
させるものである。作業者は肩に刈払機を吊り下げ、操
作杆の途中に設けたバー状ハンドルを握って操作杆を前
後左右に振ることで、刈刃にて雑草を刈ることができ
る。In the brush cutter, a drive shaft is passed through a pipe-shaped operating rod, and the driving shaft is rotated by a motor provided at one end of the operating rod, thereby rotating a cutting blade provided at the other end of the operating rod. Things. An operator can cut weeds with a cutting blade by hanging a brush cutter on a shoulder, grasping a bar-shaped handle provided in the middle of the operating rod, and swinging the operating rod back and forth and right and left.
【０００４】ところで近年、農作業における労働環境を
より一層改善することが求められている。刈払機におい
ても作業者の負担を軽減する上で、駆動軸から操作杆を
介してバー状ハンドルに伝わる振動を、より低減すると
いう要求が高まっている。操作杆に通した駆動軸は長い
ので、自重によるたわみが大きい。この結果、原動機を
回転させたときに、駆動軸には自重による撓み振動（た
わみ振動）が生じる。たわみ振動を低減させる方法とし
ては、駆動軸を軸長手方向に多数の軸受で支持した
り、駆動軸を軽量にすることが一般的である。[0004] In recent years, it has been required to further improve the working environment in agricultural work. In the brush cutter, too, in order to reduce the burden on the operator, there is an increasing demand for further reducing the vibration transmitted from the drive shaft to the bar-shaped handle via the operating rod. Since the drive shaft passed through the operating rod is long, the deflection due to its own weight is large. As a result, when the prime mover is rotated, bending vibration (deflection vibration) occurs on the drive shaft due to its own weight. As a method of reducing flexural vibration, it is common to support the drive shaft with a large number of bearings in the longitudinal direction of the shaft or to reduce the weight of the drive shaft.
【０００５】これらのうち、多数の軸受を設けることで
軸受間の距離を小さくする方法は、構造上の制限や刈払
機の全重量アップの点から限界がある。そこで、駆動軸
を軽量にする方法が研究されてきた。従来は駆動軸に棒
鋼や鋼管を用いていた。駆動軸を軽量化するには軸径を
小さくしたり、薄肉のパイプ材にしたり、軽量の材料に
代えることが考えられる。[0005] Among them, the method of reducing the distance between the bearings by providing a large number of bearings has limitations in terms of structural limitations and increase in the total weight of the brush cutter. Therefore, methods for reducing the weight of the drive shaft have been studied. Conventionally, a steel bar or a steel pipe has been used for the drive shaft. In order to reduce the weight of the drive shaft, it is conceivable to reduce the shaft diameter, use a thin pipe material, or substitute a lightweight material.
【０００６】ところで、駆動軸は原動機の動力を刈刃に
伝達するものであるから、一定以上のねじり剛性や曲げ
剛性も必要である。このため、小径にしたり薄肉のパイ
プ材にするには限界がある。一方、材料を変更すること
で駆動軸を軽量にする方法としては、駆動軸をアルミニ
ウム合金材にすることが考えられる。しかし、アルミニ
ウム合金材は軽量ではあるものの、必要な剛性を確保す
るには限界がある。[0006] Since the drive shaft transmits the power of the prime mover to the cutting blade, it is necessary that the drive shaft has a certain torsional rigidity or bending rigidity. For this reason, there is a limit in reducing the diameter or making the pipe material thin. On the other hand, as a method of reducing the weight of the drive shaft by changing the material, it is conceivable to use an aluminum alloy material for the drive shaft. However, although the aluminum alloy material is lightweight, there is a limit in securing required rigidity.
【０００７】他に、材料を変更することで駆動軸を軽量
にするようにした刈払機としては、例えば実公平１−３
０９９５号公報「刈払機の操作桿」（以下、「従来の技
術」と言う。）や特開平８−２０５６４９号公報「刈
払機用伝動軸とその製造方法並びに刈払機用操作桿」
（以下、「従来の技術」と言う。）が知られている。Another example of a brush cutter in which the drive shaft is reduced in weight by changing the material is, for example, an actual brush 1-3.
No. 0995, "Operating stick for brush cutter" (hereinafter referred to as "prior art") and Japanese Patent Application Laid-Open No. 8-205649, "Transmission shaft for bush cutter, method for manufacturing the same, and operating stick for brush cutter"
(Hereinafter referred to as “conventional technology”).
【０００８】上記従来の技術は同公報の第１図及び第
２図に示される通り、パイプ状の主管４（番号は公報に
記載されたものを引用した。以下同じ。）に通した伝動
軸５を動力部１で駆動することによって、主管４の先端
に設けた刃物部２を回転させるというものである。さら
に上記従来の技術は、伝動軸５の材質を鋼材から樹脂
材に代えて軽量化することで、伝動軸５のたわみ振動の
低減を図ったものである。In the above prior art, as shown in FIGS. 1 and 2 of the publication, a transmission shaft passing through a pipe-shaped main pipe 4 (numbers are quoted in the publication; the same applies hereinafter). The blade unit 2 provided at the tip of the main pipe 4 is rotated by driving the power unit 5 with the power unit 1. Further, in the above-mentioned conventional technique, the transmission shaft 5 is reduced in weight by changing the material of the transmission shaft 5 from a steel material to a resin material to reduce flexural vibration of the transmission shaft 5.
【０００９】また、上記従来の技術は同公報の図３に
示される通り、繊維強化樹脂管５０の両端の孔に金属製
ジョイント５３を嵌合し接着剤にて接合し、さらに繊維
強化樹脂管５０の端部を補強リング５４で締め付けるこ
とで固定したというものである。このようにして組合せ
た部材は、刈払機用伝動軸として採用することができ
る。In the above prior art, as shown in FIG. 3 of the publication, metal joints 53 are fitted into holes at both ends of a fiber reinforced resin pipe 50 and joined with an adhesive. That is, the end portion 50 is fixed by tightening it with a reinforcing ring 54. The members combined in this manner can be employed as a transmission shaft for a brush cutter.
【００１０】[0010]
【発明が解決しようとする課題】しかし上記従来の技術
は、伝動軸５の材質を単に鋼材から樹脂材に代えたも
のである。一般に樹脂製軸は、ねじり剛性や曲げ剛性が
小さいものであり、その分を何等かの方法で補う必要が
ある。剛性を確保するために軸径を大きくしたのでは、
軽量化に逆行する。さらに上記従来の技術は、動力部
１の出力軸や刃物部２に対する伝動軸５の連結構造が不
明である。出力軸や刃物部２は金属製品であるから、金
属製品に樹脂製伝動軸５を確実に連結し、その連結強度
を高めることは容易でない。However, in the above-mentioned prior art, the material of the transmission shaft 5 is simply changed from steel to resin. Generally, a resin shaft has low torsional rigidity and bending rigidity, and it is necessary to compensate for that by some method. If you increase the shaft diameter to secure rigidity,
Goes against weight reduction. Further, in the above-described conventional technique, the connection structure of the transmission shaft 5 to the output shaft of the power unit 1 and the blade unit 2 is unknown. Since the output shaft and the blade portion 2 are metal products, it is not easy to reliably connect the resin transmission shaft 5 to the metal product and increase the connection strength.
【００１１】一方、上記従来の技術は、繊維強化樹脂
管５０の剛性を高める配慮をしたものである。しかし、
繊維強化樹脂管５０であっても、これに鋼材と同等の剛
性を求めると軸径や肉厚が増すことになりかねない。軸
径を増すと、繊維強化樹脂管５０を通す主管（操作杆に
相当。）も大径になるので得策ではない。さらに上記従
来の技術は、繊維強化樹脂管５０に対する金属製ジョ
イント５３の結合構造が複雑である。しかも、樹脂製品
と金属製品の結合であるから、結合部分の耐久性を確保
することが容易でない。On the other hand, the above-mentioned conventional technique is designed to increase the rigidity of the fiber reinforced resin pipe 50. But,
Even if the fiber-reinforced resin tube 50 is required to have the same rigidity as that of steel, the shaft diameter and the wall thickness may increase. If the shaft diameter is increased, the main pipe (corresponding to an operating rod) through which the fiber reinforced resin pipe 50 passes becomes large in diameter, which is not advantageous. Further, in the above-described conventional technique, the connection structure of the metal joint 53 to the fiber reinforced resin pipe 50 is complicated. In addition, since it is a connection between a resin product and a metal product, it is not easy to ensure the durability of the connection portion.
【００１２】そこで本発明の目的は、第１に、刈払機の
駆動軸の径を増すことなく剛性を確保しつつ、駆動軸に
発生する振動をより低減でき、第２に、駆動軸の両端
を、原動機の出力軸や刈刃に確実に連結できるととも
に、連結部分の耐久性を確保できる技術を提供すること
にある。Therefore, the object of the present invention is to firstly reduce vibrations of the drive shaft while securing rigidity without increasing the diameter of the drive shaft of the brush cutter. The present invention is to provide a technology capable of reliably connecting the motor to an output shaft or a cutting blade of a prime mover and ensuring durability of a connecting portion.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するため
に請求項１は、パイプ状の操作杆に駆動軸を通し、この
駆動軸を、操作杆の一端に設けた原動機にて回転させる
ことで、操作杆の他端に設けた刈刃を回転させる形式の
刈払機において、駆動軸を、チタン合金製軸部の両端に
鋼製軸端部を一体的に取付けてなる異種金属組合せ軸と
したことを特徴とする。According to a first aspect of the present invention, a drive shaft is passed through a pipe-shaped operation rod, and the drive shaft is rotated by a motor provided at one end of the operation rod. In a brush cutter of a type in which a cutting blade provided at the other end of the operating rod is rotated, a drive shaft is formed of a combination of dissimilar metal shafts having steel shaft ends integrally attached to both ends of a titanium alloy shaft. It is characterized by having done.
【００１４】チタン合金は、鉄鋼と概ね同等の機械的強
度（ねじり強さ・曲げ強さや縦弾性係数など）を有する
とともに、鉄鋼よりも比重が小さい。このため、従来と
同一径の軸部であっても、刈払機の駆動軸として必要な
ねじり剛性や曲げ剛性を十分に確保することができる。
しかも、軽量の軸部を採用したので、自重によるたわみ
振動をより低減させることができる。さらには、チタン
合金製軸部の両端に鋼製軸端部を一体的に取付けたので
あるから、軸部に対する軸端部の結合部分の耐久性を確
保することができる。しかも、軸端部を原動機の出力軸
や刈刃に確実に連結できるとともに、この連結部分の耐
久性を確保できる。[0014] Titanium alloys have mechanical strengths (such as torsional strength / bending strength and longitudinal elastic modulus) which are almost the same as those of steel, and have a lower specific gravity than steel. For this reason, even if the shaft portion has the same diameter as the conventional one, it is possible to sufficiently secure the torsional rigidity and the bending rigidity required as the drive shaft of the brush cutter.
In addition, since a lightweight shaft is employed, flexural vibration due to its own weight can be further reduced. Furthermore, since the steel shaft ends are integrally attached to both ends of the titanium alloy shaft, the durability of the joint portion of the shaft end to the shaft can be ensured. In addition, the shaft end can be reliably connected to the output shaft of the prime mover and the cutting blade, and the durability of the connection can be ensured.
【００１５】[0015]
【発明の実施の形態】本発明の実施の形態を添付図に基
づいて以下に説明する。なお、図面は符号の向きに見る
ものとする。図１は本発明に係る刈払機の側面図であ
る。刈払機１０は、パイプ状の操作杆１１に駆動軸１２
を通し、この駆動軸１２を、操作杆１１の一端に設けた
原動機１３にて回転させることで、操作杆１１の他端に
設けた刈刃１４を回転させる形式の刈払機である。さら
に刈払機１０は、操作杆１１の長手中央部にハンドル１
５を平面視十文字を呈するようにハンドルホルダ１６で
固定したものである。原動機１３はエンジン又は電動モ
ータである。Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a side view of the brush cutter according to the present invention. The brush cutter 10 includes a pipe-shaped operating rod 11 and a drive shaft 12.
And the drive shaft 12 is rotated by a prime mover 13 provided at one end of the operating rod 11 to rotate a cutting blade 14 provided at the other end of the operating rod 11. Further, the brush cutter 10 is provided with a handle 1 at the longitudinal center of the operating rod 11.
5 is fixed by a handle holder 16 so as to present a cross in a plan view. The prime mover 13 is an engine or an electric motor.
【００１６】図２は本発明に係る刈払機の使用状態を示
す説明図である。バー状のハンドル１５は正面視略Ｕ字
状を呈し、中央部を操作杆１１に取付けるとともに左右
に延びる１本のパイプ材又はバー部材からなり、左右の
先端にグリップ（左のグリップ１７及び右のグリップ１
８）を設けたものである。右のグリップ１８は原動機１
３を制御するスロットルレバーやロックレバーを備える
操作部である。FIG. 2 is an explanatory view showing the state of use of the brush cutter according to the present invention. The bar-shaped handle 15 has a substantially U-shape when viewed from the front, and has a central portion attached to the operating rod 11 and is formed of a single pipe or bar member extending left and right. Grip 1
8). Right grip 18 is prime mover 1
3 is an operation unit including a throttle lever and a lock lever for controlling the control lever 3.
【００１７】作業者Ｍは、操作杆１１の長手途中に備え
る肩掛け用吊りベルト１９を肩に掛けることで刈払機１
０を吊り下げることができる。そして、左右のグリップ
１７，１８を握って操作杆１１を前後左右に振りなが
ら、原動機１３で刈刃１４を回転させることで、雑草ｇ
ｒを刈ることができる。The worker M hangs the shoulder-hanging suspending belt 19 provided in the middle of the operating rod 11 in the longitudinal direction on the shoulder to thereby remove the brush cutter 1.
0 can be suspended. By rotating the cutting blade 14 with the prime mover 13 while holding the left and right grips 17 and 18 and swinging the operation rod 11 back and forth, weed g
r can be mowed.
【００１８】図３は本発明に係る刈払機の要部断面図で
あり、駆動軸１２と原動機１３の出力軸１３ａとの間に
クラッチ機構３０を介在させ、このクラッチ機構３０を
クラッチケース４０に収納するようにし、このクラッチ
ケース４０を介して操作杆１１の一端部に原動機１３を
取付けたことを示す。このような刈払機１０は、操作杆
１１並びに駆動軸１２を原動機１３の出力軸１３ａに同
心に配置したものである。FIG. 3 is a sectional view of a main part of the brush cutter according to the present invention. A clutch mechanism 30 is interposed between the drive shaft 12 and the output shaft 13a of the prime mover 13, and the clutch mechanism 30 is mounted on the clutch case 40. This shows that the prime mover 13 is attached to one end of the operating rod 11 via the clutch case 40. In such a brush cutter 10, the operating rod 11 and the drive shaft 12 are arranged concentrically with the output shaft 13a of the prime mover 13.
【００１９】クラッチ機構３０は、駆動軸１２の原動機
側軸端部２２にスプライン結合で取付けたクラッチドラ
ム３１と、原動機１３の出力軸１３ａに取付けた回転部
材３２と、回転部材３２が高速回転したときだけ回転部
材３２をクラッチドラム３１に連結するクラッチ部材３
３と、からなる遠心クラッチである。クラッチドラム３
１は、回転部材３２を包囲するカップ状部材である。The clutch mechanism 30 includes a clutch drum 31 attached to the motor shaft end 22 of the drive shaft 12 by spline coupling, a rotating member 32 attached to the output shaft 13a of the motor 13, and a rotating member 32 that rotates at high speed. Only when the clutch member 3 connects the rotating member 32 to the clutch drum 31
3 is a centrifugal clutch consisting of: Clutch drum 3
1 is a cup-shaped member surrounding the rotating member 32.
【００２０】クラッチケース４０は、操作杆１１の一端
部を取付ける操作杆取付部４１と、操作杆取付部４１か
ら原動機１３側へ延びて可撓性を有する可撓連結部４２
と、可撓連結部４２から原動機１３側へ延びて原動機１
３に取付ける原動機取付部４３と、からなる樹脂製一体
成形品である。原動機取付部４３は原動機１３のケース
１３ｂにボルト止めにて取付けたものである。The clutch case 40 includes an operating rod mounting portion 41 for attaching one end of the operating rod 11 and a flexible connecting portion 42 extending from the operating rod mounting portion 41 to the prime mover 13 and having flexibility.
The motor 1 extends from the flexible connecting portion 42 to the motor 13 side.
And a motor mounting portion 43 mounted on the motor 3. The motor mounting portion 43 is mounted on the case 13b of the motor 13 with bolts.
【００２１】さらにこの図３は、操作杆１１の他端部に
伝動機構ケース６１を介して刈刃１４を取付け、駆動軸
１２と刈刃１４との間に介在させた伝動機構６２を伝動
機構ケース６１に収納するようにしたことを示す。伝動
機構６２は、駆動軸１２の刈刃側軸端部２６に連結した
駆動ベベルギヤ６３と、駆動ベベルギヤ６３に噛み合う
従動ベベルギヤ６４と、従動ベベルギヤ６４並びに刈刃
１４を取付けた従動軸６５とからなる。Further, FIG. 3 shows a cutting blade 14 attached to the other end of the operating rod 11 via a transmission mechanism case 61, and a transmission mechanism 62 interposed between the drive shaft 12 and the cutting blade 14. This indicates that the case 61 is stored. The transmission mechanism 62 includes a drive bevel gear 63 connected to the cutting blade side shaft end 26 of the drive shaft 12, a driven bevel gear 64 that meshes with the drive bevel gear 63, and a driven shaft 65 to which the driven bevel gear 64 and the cutting blade 14 are attached. .
【００２２】ところで駆動軸１２は、軸長手方向の複数
箇所が回転可能に支承されたものである。具体的には駆
動軸１２を次の箇所で支承した。第１に、原動機側軸端
部２２をクラッチドラム３１のボス３４にスプライン結
合し、このボス３４を軸受３５，３５にて支持すること
で、駆動軸１２の一端部をボス３４並びに軸受３５，３
５を介して原動機取付部４３で支承した。第２に、刈刃
側軸端部２６を駆動ベベルギヤ６３に結合し、この駆動
ベベルギヤ６３を軸受６６，６６にて支持することで、
駆動軸１２の他端部を駆動ベベルギヤ６３並びに軸受６
６，６６を介して伝動機構ケース６１で支承した。第３
に、駆動軸１２のうち原動機側軸端部２２と刈刃側軸端
部２６との間を、軸長手方向に一定間隔で配列した複数
のブッシュ７６・・・（・・・は複数を示す。以下同じ。）を
介して操作杆１１で支承した。なお、６７は従動軸支持
用軸受である。The drive shaft 12 is rotatably supported at a plurality of positions in the longitudinal direction of the shaft. Specifically, the drive shaft 12 was supported at the following locations. First, the motor-side shaft end 22 is spline-coupled to the boss 34 of the clutch drum 31, and this boss 34 is supported by bearings 35, 35. Three
5, and was supported by the motor mounting portion 43. Second, the cutting blade side shaft end 26 is connected to the drive bevel gear 63, and the drive bevel gear 63 is supported by bearings 66, 66,
The other end of the drive shaft 12 is connected to the drive bevel gear 63 and the bearing 6.
6 and 66 and supported by a transmission mechanism case 61. Third
In the drive shaft 12, a plurality of bushes 76,. The same applies hereinafter.). Reference numeral 67 denotes a driven shaft supporting bearing.
【００２３】図４（ａ）〜（ｃ）は本発明に係る駆動軸
の構成図であり、（ａ）は駆動軸１２の軸長手途中を省
略した側面断面構造を示し、（ｂ）は（ａ）のｂ−ｂ線
断面構造を示し、（ｃ）は（ａ）のｃ部を拡大して示
す。駆動軸１２は、チタン合金製軸部２１の両端に鋼製
軸端部（原動機側軸端部２２及び刈刃側軸端部２６）を
一体的に取付けてなる異種金属組合せ軸であることを特
徴とする。以下に駆動軸１２について詳しく説明する。FIGS. 4A to 4C are diagrams showing the construction of the drive shaft according to the present invention, wherein FIG. 4A shows a side cross-sectional structure of the drive shaft 12 in which a portion in the longitudinal direction of the drive shaft 12 is omitted, and FIG. 2A shows a cross-sectional structure taken along the line bb in FIG. 3A, and FIG. The drive shaft 12 is a dissimilar metal combination shaft in which steel shaft ends (motor-side shaft end 22 and cutting blade-side shaft end 26) are integrally attached to both ends of a titanium alloy shaft 21. Features. Hereinafter, the drive shaft 12 will be described in detail.
【００２４】軸部２１は、例えば外径７ｍｍで長さ１５
００ｍｍのチタン合金製パイプである。原動機側軸端部
２２は、例えば機械構造用炭素鋼鋼材製丸棒であり、基
端部２３を軸部２１に嵌合するとともに真空ろう付によ
って一体的に取付け、先端部２４に雄スプライン２５を
形成したものである。刈刃側軸端部２６は、例えば機械
構造用炭素鋼鋼材製丸棒であり、基端部２７を軸部２１
に嵌合するとともに真空ろう付によって一体的に取付
け、先端部２８の外周面を４面取りすることで（ｂ）の
ように略四角形断面の嵌合凸部２９に形成したものであ
る。The shaft portion 21 has, for example, an outer diameter of 7 mm and a length of 15 mm.
This is a 00 mm titanium alloy pipe. The motor-side shaft end 22 is, for example, a round bar made of carbon steel material for machine structure. The base end 23 is fitted to the shaft 21 and integrally attached by vacuum brazing. Is formed. The cutting blade side shaft end 26 is, for example, a round bar made of carbon steel material for machine structure, and the base end 27 is connected to the shaft 21.
, And are integrally attached by vacuum brazing, and the outer peripheral surface of the distal end portion 28 is chamfered to form a fitting convex portion 29 having a substantially square cross section as shown in FIG.
【００２５】（ｃ）は、軸部２１に対する刈刃側軸端部
２６の取付構造を示す。刈刃側軸端部２６の基端部２７
は、パイプからなる軸部２１の孔に嵌合する嵌合部２７
ａと、嵌合部２７ａに連なり軸部２１の端面に突き当て
る突当部２７ｂとからなる。軸部２１の孔に嵌合部２７
ａを必要十分な長さだけ嵌合したので、この部分に曲げ
荷重が作用しても曲げ剛性を十分に確保することができ
る。このように嵌合した上に、更に軸部２１の端面と突
当部２７ｂとの当り面を真空ろう付することで、両者を
一体的に取付けることができる。FIG. 3C shows a mounting structure of the cutting blade side shaft end 26 to the shaft 21. Base end 27 of cutting blade side shaft end 26
Is a fitting portion 27 that fits into the hole of the shaft portion 21 made of a pipe.
a and an abutting portion 27b connected to the fitting portion 27a and abutting against the end surface of the shaft portion 21. The fitting portion 27 is inserted into the hole of the shaft portion 21.
Since a is fitted by a necessary and sufficient length, sufficient bending rigidity can be ensured even when a bending load is applied to this portion. In addition to the fitting, the contact surface between the end surface of the shaft portion 21 and the abutting portion 27b is further brazed by vacuum so that the two can be integrally attached.
【００２６】なお、軸部２１に対する原動機側軸端部２
２の取付構造についても、上記刈刃側軸端部２６の取付
構造と同様に嵌合部２３ａと突当部２３ｂとからなる。
ここで「真空ろう付」とは、例えば炉内ろう付におい
て、ろう付環境を１３３×１０-3〜１３３×１０-7Ｐａ
の真空とした清浄な空間で行う、ろう付方法である。The motor-side shaft end 2 with respect to the shaft 21
The mounting structure 2 also includes the fitting portion 23a and the abutting portion 23b, similarly to the mounting structure of the cutting blade side shaft end 26.
Here, "vacuum brazing" means, for example, in brazing in a furnace, the brazing environment is from 133 × 10 −3 to 133 × 10 −7 Pa.
This is a brazing method performed in a clean space with a vacuum.
【００２７】チタン合金は、鉄鋼と概ね同等の機械的強
度（ねじり強さ・曲げ強さや縦弾性係数など）を有す
る。従って、チタン合金製軸部２１は、従来と同一径の
軸であっても、刈払機の駆動軸として必要なねじり剛性
や曲げ剛性を十分に確保することができる。さらに、鉄
鋼の比重が概ね７．８であるのに対してチタン合金の比
重は概ね４．５である。このように、チタン合金の比重
は鉄鋼の比重よりも極めて小さい。このような軽量のチ
タン合金製軸部２１を採用したので、自重によるたわみ
振動をより低減させることができる。従って、上記図２
において原動機１３を回転させたときに、駆動軸１２か
ら操作杆１１を介してハンドル１５に伝わる振動を、簡
単な構成で、より低減することができる。この結果、作
業者Ｍの負担を軽減することができる。[0027] Titanium alloys have mechanical strength (such as torsional strength / bending strength, longitudinal elastic modulus, etc.) substantially equal to that of steel. Therefore, the titanium alloy shaft portion 21 can sufficiently secure the torsional rigidity and the bending rigidity required as the drive shaft of the brush cutter, even if the shaft has the same diameter as the conventional one. Furthermore, while the specific gravity of steel is approximately 7.8, the specific gravity of a titanium alloy is approximately 4.5. Thus, the specific gravity of the titanium alloy is much smaller than that of the steel. Since such a lightweight titanium alloy shaft portion 21 is employed, flexural vibration due to its own weight can be further reduced. Therefore, FIG.
When the prime mover 13 is rotated, the vibration transmitted from the drive shaft 12 to the handle 15 via the operating rod 11 can be further reduced with a simple configuration. As a result, the burden on the worker M can be reduced.
【００２８】さらには、チタン合金製軸部２１の両端に
鋼製軸端部（原動機側軸端部２２及び刈刃側軸端部２
６）を一体的に取付けることによって、軸部２１に対す
る軸端部２２，２６の結合部分の耐久性を確保すること
ができる。しかも駆動軸１２の両端、すなわち軸端部２
２，２６を上記図３に示す原動機１３の出力軸１３ａや
刈刃１４に確実に連結できるとともに、この連結部分の
耐久性を確保することができる。Further, steel shaft ends (motor-side shaft end 22 and cutting blade-side shaft end 2) are provided at both ends of the titanium alloy shaft 21.
By integrally attaching 6), the durability of the joint portion between the shaft end portions 22 and 26 with respect to the shaft portion 21 can be ensured. Moreover, both ends of the drive shaft 12, that is, the shaft end 2
3, 26 can be reliably connected to the output shaft 13a and the cutting blade 14 of the prime mover 13 shown in FIG. 3, and the durability of the connection portion can be ensured.
【００２９】なお、上記本発明の実施の形態において、
チタン合金製軸部２１の両端に鋼製軸端部２２，２６を
一体的に取付ける構造は、真空ろう付に限定するもので
はなく、両者間を一体化できるものであればよく、例え
ばリベット止め、溶接、接着による構造であってもよ
い。In the embodiment of the present invention,
The structure in which the steel shaft end portions 22 and 26 are integrally attached to both ends of the titanium alloy shaft portion 21 is not limited to vacuum brazing, and may be any structure as long as the two can be integrated. , Welding or bonding.
【００３０】[0030]
【発明の効果】本発明は上記構成により次の効果を発揮
する。請求項１は、刈払機の駆動軸のうち軸部を、鉄鋼
と概ね同等の機械的強度を有するとともに鉄鋼よりも比
重が小さい、チタン合金製とすることによって軽量化し
たので、駆動軸として必要なねじり剛性や曲げ剛性を十
分に確保することができるとともに、自重によるたわみ
振動をより低減させることができる。従って、駆動軸か
ら操作杆を介してハンドルに伝わる振動を、簡単な構成
で、より低減することができる。According to the present invention, the following effects are exhibited by the above configuration. Claim 1 requires a shaft as a drive shaft because the shaft portion of the drive shaft of the brush cutter is made of a titanium alloy having substantially the same mechanical strength as steel and having a lower specific gravity than steel. In addition to ensuring sufficient torsional rigidity and bending rigidity, flexural vibration due to its own weight can be further reduced. Therefore, vibration transmitted from the drive shaft to the handle via the operating rod can be further reduced with a simple configuration.
【００３１】さらには、チタン合金製軸部の両端に鋼製
軸端部を一体的に取付けることによって、軸部に対する
軸端部の結合部分の耐久性を確保することができる。し
かも、軸端部を原動機の出力軸や刈刃に確実に連結でき
るとともに、この連結部分の耐久性を確保することがで
きる。このようにして、駆動軸の両端を、原動機の出力
軸や刈刃に確実に連結することができるとともに、連結
部分の耐久性を確保することができる。Further, by integrally attaching the steel shaft ends to both ends of the titanium alloy shaft portion, the durability of the joint portion of the shaft end portion to the shaft portion can be ensured. In addition, the shaft end can be reliably connected to the output shaft or the cutting blade of the prime mover, and the durability of the connection can be ensured. In this way, both ends of the drive shaft can be reliably connected to the output shaft of the prime mover and the cutting blade, and the durability of the connection portion can be ensured.
【図１】本発明に係る刈払機の側面図FIG. 1 is a side view of a brush cutter according to the present invention.
【図２】本発明に係る刈払機の使用状態を示す説明図FIG. 2 is an explanatory view showing a use state of the brush cutter according to the present invention.
【図３】本発明に係る刈払機の要部断面図FIG. 3 is a sectional view of a main part of the brush cutter according to the present invention.
【図４】本発明に係る駆動軸の構成図FIG. 4 is a configuration diagram of a drive shaft according to the present invention.
１０…刈払機、１１…操作杆、１２…駆動軸、１３…原
動機、１４…刈刃、１５…ハンドル、２１…チタン合金
製軸部、２２，２６…鋼製軸端部としての原動機側軸端
部及び刈刃側軸端部。DESCRIPTION OF SYMBOLS 10 ... brush cutter, 11 ... operating rod, 12 ... drive shaft, 13 ... prime mover, 14 ... cutting blade, 15 ... handle, 21 ... titanium alloy shaft part, 22, 26 ... steel shaft end as steel shaft end End and cutting blade side shaft end.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐々木 英志 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内 Ｆターム(参考） 2B083 AA02 BA02 CA07 DA02 EA08 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Eiji Sasaki 1-4-1 Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. (Reference) 2B083 AA02 BA02 CA07 DA02 EA08
Claims (1)
駆動軸を操作杆の一端に設けた原動機にて回転させるこ
とで、操作杆の他端に設けた刈刃を回転させる形式の刈
払機において、前記駆動軸は、チタン合金製軸部の両端
に鋼製軸端部を一体的に取付けてなる異種金属組合せ軸
であることを特徴とした刈払機の駆動軸構造。1. A type in which a drive shaft is passed through a pipe-shaped operating rod, and the driving shaft is rotated by a motor provided at one end of the operating rod, thereby rotating a cutting blade provided at the other end of the operating rod. In the brush cutter, the drive shaft is a dissimilar metal combination shaft in which steel shaft ends are integrally attached to both ends of a titanium alloy shaft portion.
Priority Applications (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001052958A JP2002253027A (en) | 2001-02-27 | 2001-02-27 | Driving shaft structure of bush cutter |
| US10/078,858 US6722041B2 (en) | 2001-02-27 | 2002-02-19 | Plant cutter apparatus |
| CA002372622A CA2372622C (en) | 2001-02-27 | 2002-02-20 | Plant cutter apparatus |
| KR1020020009204A KR100849031B1 (en) | 2001-02-27 | 2002-02-21 | Plant cutter apparatus |
| TW091103325A TW529901B (en) | 2001-02-27 | 2002-02-25 | Plant cutter apparatus |
| EP20020004409 EP1234492B1 (en) | 2001-02-27 | 2002-02-26 | Plant cutter apparatus |
| DE60204368T DE60204368T2 (en) | 2001-02-27 | 2002-02-26 | Device for cutting plants |
| EP02004407A EP1234490B1 (en) | 2001-02-27 | 2002-02-26 | Plant cutter apparatus |
| EP20020004408 EP1234491B1 (en) | 2001-02-27 | 2002-02-26 | Plant cutter apparatus |
| DE2002602976 DE60202976T2 (en) | 2001-02-27 | 2002-02-26 | Device for cutting plants |
| DE2002601694 DE60201694T2 (en) | 2001-02-27 | 2002-02-26 | Device for cutting plants |
| CNB02106654XA CN100415074C (en) | 2001-02-27 | 2002-02-27 | Plant uproot device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001052958A JP2002253027A (en) | 2001-02-27 | 2001-02-27 | Driving shaft structure of bush cutter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002253027A true JP2002253027A (en) | 2002-09-10 |
Family
ID=18913500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001052958A Pending JP2002253027A (en) | 2001-02-27 | 2001-02-27 | Driving shaft structure of bush cutter |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6722041B2 (en) |
| EP (1) | EP1234490B1 (en) |
| JP (1) | JP2002253027A (en) |
| KR (1) | KR100849031B1 (en) |
| CN (1) | CN100415074C (en) |
| CA (1) | CA2372622C (en) |
| DE (1) | DE60204368T2 (en) |
| TW (1) | TW529901B (en) |
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-
2001
- 2001-02-27 JP JP2001052958A patent/JP2002253027A/en active Pending
-
2002
- 2002-02-19 US US10/078,858 patent/US6722041B2/en not_active Expired - Fee Related
- 2002-02-20 CA CA002372622A patent/CA2372622C/en not_active Expired - Fee Related
- 2002-02-21 KR KR1020020009204A patent/KR100849031B1/en not_active IP Right Cessation
- 2002-02-25 TW TW091103325A patent/TW529901B/en not_active IP Right Cessation
- 2002-02-26 EP EP02004407A patent/EP1234490B1/en not_active Expired - Fee Related
- 2002-02-26 DE DE60204368T patent/DE60204368T2/en not_active Expired - Lifetime
- 2002-02-27 CN CNB02106654XA patent/CN100415074C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008254168A (en) * | 2007-03-31 | 2008-10-23 | Andreas Stihl Ag & Co Kg | Shaft system for portable working machine operated by hand and portable working machine operated by hand |
| JP2012020775A (en) * | 2010-07-16 | 2012-02-02 | Hosokawa Yoko Co Ltd | Filling/packaging machine |
Also Published As
| Publication number | Publication date |
|---|---|
| TW529901B (en) | 2003-05-01 |
| KR100849031B1 (en) | 2008-07-29 |
| DE60204368D1 (en) | 2005-07-07 |
| US6722041B2 (en) | 2004-04-20 |
| CA2372622A1 (en) | 2002-08-27 |
| US20020116828A1 (en) | 2002-08-29 |
| CN100415074C (en) | 2008-09-03 |
| CN1371592A (en) | 2002-10-02 |
| EP1234490B1 (en) | 2005-06-01 |
| EP1234490A1 (en) | 2002-08-28 |
| CA2372622C (en) | 2005-12-20 |
| DE60204368T2 (en) | 2005-10-27 |
| KR20020070103A (en) | 2002-09-05 |
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